Sonnysplace

Well, the Mack left today. I told the driver about you guys and the gray paint. He says, "funny, I told my boss how all the engines I've blown up over the years were all painted the wrong colors".... Didn't help the cam in this truck, but maybe he meant in the past.

It fought hard, but after finding a bad battery in the left side box we finally got it spinning over good enough. Then we had issues with the valves not sealing very good. I could hear it hissing out the intake. We started hosing the intake down with WD-40 and finally got compression on one cyl. It started letting out one little knock every time it would make a revolution. We finally gave up on it and I went home and Dad went up and ate dinner. He called a few minutes ago and said it fired up on 3 cyls and after about 10 seconds of missing it smoothed out. He says it sounds pretty good now, has good throttle response, and filled the whole shop with smoke!

Well, it's bolted back in. Now if I can hook all the little stuff up and get it running we'll see if this guy bought a good runner or a big headache.

Yeah, I'm not crazy about it either. I guess the guy has 2 big barrels of paint he uses, one white and one red. Sorry, no gray. If it runs I'll be happy.

Here's the proof! It's hanging on the hook ready to go back in. Thanks again guys!

I finally found a pic of the old girl.

Thanks guys! I have it on 6 degrees BTDC on number one and both lights on, just have to get the gear put in and see how close I can get it. Was there originally a pointer in that little hole in the bellhousing? I found a #2 phillips fits right in there, just curious.

I finally heard back from the owner. The twin truck is stamped 6 degrees, so I'll go with that. They are supposed to be 400s. There is an allen plug on the side of the pump under the number 1 barrel, so that means to time it number 1? The VMAC book talks like they are all timed on #6. The book does stop at 92 though...

I don't really know what HP it is supposed to be. Not like they advertised it on there anywhere. I think the owner said it's a 400? As you can tell, this is the newest Mack we've had in the shop. We usually see older models in the Macks around here, but I guess times are changing. The old endt stuff is all approaching antique status. We're just starting to see C-15 Cats instead of 3406's too.

We found an A-B box at our local pump shop! They even UPS'd it to us today to use. Nice guys! Now if I someone had thought to put the static timing mark on the valve cover my worries would be over. I did find a few timing settings in the VMAC manual, but only up to 92. They ranged all over from 5 to 11 degrees. The truck owner says he has a twin truck to this one and he'll check the cover on it, so we'll see. I got all the parts swapped between the engines so next week we'll bring the truck back and see about getting it stuffed back in. I forgot my camera or I'd have snapped a couple pics of it.

Actually I have a manual, but it doesn't have any timing figures in it. We are switching the pump and electronics from a 95 to a 92 engine. Naturally the valve cover plate is gone and there is no figure stamped on the other engine as it was a Mack rebuild in 96 and they didn't fill in very many of the blanks. The truck owner talked to the guys he got the engine from. They said to finish the truck with the exception of the timing and valve settings and he will send a guy out to make sure it's right before we fire it. I'm sure I could've figure it out if I had a degree to set it to, but if they want to send their guy out that's OK. I had the back off the pump today to replace the wiring connector so I saw the pointer in there for the timing. Looks pretty straight forward to me. Thanks for the tips guys.

Has anyone figured out a way to get the pump timed on an electronic E7 without buying that expensive little box with the 2 lights on it? Another problem, I can't even find a static timing figure to set the engine to if I had the timing box??? I looked at the flywheel today to see if it was marked but only see a couple nicks on the edge around 32 and 38 degrees? That's gotta be just some random digs by something that went around the bell housing I'm thinking. Thoughts?

I'm ready to pull the engine out. All I can say is this vintage has got to be the most miserable truck I've ever tried to pull the engine out of! Man! Took most of the afternoon just to get the top 4 bell housing bolts out! Must be why later year trucks raised the cab higher off the frame. Oh well, out if comes in the morning!

I don't see any damage to it. He claimed the parts alone were over 3 grand and he says he's found a complete engine for around 4. We'll see...

Brad, it's all there, but it needs a lot of work. It has the gas motor in it. We hooked a battery up to it a couple years ago and it 'almost' started. I thought I had a shot of it, but I guess not. Next time I'm at the shop I'll see about snapping a couple pics. Thanks for the welcome everyone!

Well, the truck owner priced the parts to fix it, and has shifted his search to a used engine. Oh well, at this point I just want to get it running and out of the shop.

I bought a bunch of little 5 lb magnets at harbor freight tools today. We just heard about the wood dowels for the B-series Cummins a couple days ago. The last one of those we did we pulled the side cover and put gas line size hose clamps on the tops of the lifters to hold them up.

Now the trick is to figure out a way to keep the lifters up while I pull the cam.

Heard the miles are around 600 thou. Damper seems like new, liquid type by the looks of it. I'm still thinking the front cam bearing went out first. Once the cam broke, it stopped running almost instantly. All that was left of the bearing was in the pan though. Looks like it was wearing for some time before the breakage. Once the bushing fell out the leverage pulling on the cam broke it.

This one is in a 94 dump truck with a lot of miles. I'll post up more as I dig into it. Bad part is the truck just recently had the whole top end done at Mack.

I pulled the covers off the top and found 4 broken rocker arms and some bent pushrods. No chance of an easy fix on this one....

I'm a little late, but yes we just had a cam failure get pulled into the shop. As far as I can tell it looks like the front cam bearing was the first to go. Then without the support of the bearing, flex broke the cam off before the second lobe. This made some noise early on. The driver called us and was able to drive it to the shop before it gave away on a test drive around the block. It made lots of racket before it let loose, Dad said he heard it clattering off the houses on the sides of the road as they drove by. Too bad they didn't know where the noises were coming from before they took off... The driver said he thought it was the tranny clunking under load. I took a couple pics, I'll post them in a bit.

Hello from my Dad and I. We have a small shop between Snohomish and Monroe. We have worked on almost every kind of truck and piece of equipment there is at one time or another. We currently have a 94 Mack in the shop with a broken cam, so I thought it was time to join this forum and talk about all things Mack.